Pumping device
a technology of pumping device and piston, which is applied in the direction of intermeshing engagement type engines, rotary piston engines, rotary or oscillating piston engines, etc., can solve the problems of shortening the residence time of oil in the tank, unable to bring the gear, and affecting the flow rate of the pump
Active Publication Date: 2008-02-19
VOITH TURBO GMBH & CO KG
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AI Technical Summary
Benefits of technology
"The present invention provides a hydraulic pump or hydro-pump that can operate with little or no excessive pressure pulsations and a low-noise, largely cavitation-free operation. This is achieved by controlling the pressure buildup relationships in the pump so that only hydraulic medium that is nearly devoid of air enters the pressure region. The pump includes a backflow connection that controls the volume flow of hydraulic medium between the suction and pressure chambers, which prevents backflow of air and results in a high degree of efficiency. The invention also includes a method of pumping a hydraulic medium using the backflow connection. The pump can have a pressure buildup region with a higher pressure than another region of the pump, and the backflow connection is in fluid communication with the pressure and suction chambers. The pump can have a liner with a surface having at least one channel formed therein, and the backflow connection is defined at least in part by the at least one channel. The liner can have first and second segments radially adjacent to each other, and the first and second segments can be displaced radially with respect to each other."
Problems solved by technology
However, entrained air is a problem with respect to mobile tanks.
The mobile oil tanks are designed to be substantially smaller for reasons of cost and weight, which results in a shorter residence time of the oil in the tank.
As a result of this unfavorable condition, the space available to the oil in the pressure buildup region of the hydro-pump is not filled completely with oil.
Particularly in the case of gear pumps, it is not possible to bring the gear chambers in the reversing phase to the desired system pressure.
This leads to an extreme noise production and to damage to the structural parts owing to cavitation.
Method used
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[0036]Referring to FIGS. 1 through 3, an internal gear pump is shown and generally represented by reference numeral 1. The internal gear pump 1 has a pressure chamber 10, a suction chamber 20, and a displacement device, unit or member 25 having a displacement chamber 30. In the embodiment of pump 1, the displacement unit is an external toothed pinion gear 100 and an internal toothed ring gear 110, and the displacement chamber is partially defined by pressure and suction chambers 10 and 20. Pump 1 also has a liner 140.
[0037]The external toothed pinion gear 100 and the internal toothed ring gear 110 are engaged with each other in an intermeshing manner. As indicated by the dot-and-dashed central axes 111, the pinion gear 100 is mounted eccentrically in the ring gear 110. Due to this eccentric mounting, the pinion gear 100 and the ring gear 110 form a sickle-shaped space 115 between them. Inserted into this sickle-shaped space is the liner 140, which, on its front end or blunt side 170...
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A hydraulic pump is provided that reduces or eliminates unwanted noise, local pressure waves, pressure pulsations or cavitation and the like through use of pressure and suction chambers that are in substantial fluid isolation except for a backflow connection with a predetermined flow cross section to the suction chamber.
Description
RELATED APPLICATIONS[0001]This application is related to, and claims priority in, German Patent Application DE 103 34 954.5, filed Jul. 31, 2003, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to pumping devices and methods. More particularly, the present invention relates to hydraulic pumps and methods of hydraulic pumping.[0004]2. Description of Related Art[0005]Hydraulic pumps or hydro-pumps, are used to pump a hydraulic oil from a first pressure level to a second pressure level. These pumps often are supplied by, and deliver from, an oil tank in a closed circuit, so that the oil, after passing through the working section, is admitted back into the oil tank. The oil tanks are designed to be so large that they can accommodate an oil volume corresponding to three to five times the oil volume that is pumped by the pump per minute.[0006]In operation, oil that was beforehand admi...
Claims
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IPC IPC(8): F01C1/10F01C21/00F04B17/00F04C2/10F04C2/08F04C2/14F04C15/00
CPCF04C2/101F04C15/0049F04C2/088F04C2/14F04C2/10
Inventor ARBOGAST, FRANZPEIZ, PETER
Owner VOITH TURBO GMBH & CO KG